Abstract
We report on a simultaneous measurement of the top quark, W boson, and neutrino masses in tt̄ dilepton decays with 4.98fb−1 of data from the CMS experiment. The analysis is based on endpoint determinations in kinematic distributions. In addition to the unconstrained fit for three masses, the neutrino and W boson masses can be constrained to standard values; in the maximally constrained fit, the top quark mass is found to be Mt = 173.9 ± 0.9 (stat) +1.2−1.8 (syst) GeV.
Highlights
In many proposed extensions of the Standard Model, there is a new Z2 symmetry, like R parity in Supersymmetry (SUSY), under which the new physics is odd and the known particles are even
We report on a simultaneous measurement of the top quark, W boson, and neutrino masses in ttdilepton decays with 4.98fb−1 of data from the CMS experiment
New physics particles are produced in pairs and decays must terminate in a stable particle
Summary
In many proposed extensions of the Standard Model, there is a new Z2 symmetry, like R parity in Supersymmetry (SUSY), under which the new physics is odd and the known particles are even. With the production of pairs of neutrinos, dileptonic ttresembles the generic new physics topology. We test this method in data by simultaneously computing the top quark, W boson and neutrino masses. Going beyond the general study of the technique, we fix the W and neutrino masses to their known values and perform a measurement of the top quark mass. This measurement is competitive in the dilepton channel and does not rely on Monte Carlo simulation. From the known values of Mt, MW , and Mν the expected endpoints of MT(221⊥0), MT(222⊥1), and mbl are 80.4, 173, and 152.6 GeV (respectively)
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